Conservationists say flooding is having a devastating impact on wombats.

A small army of volunteers is doing what it can to prevent entire populations from being wiped out.

The area near Swan Reach in South Australia is normally dry in early summer, but recent flooding has trapped populations of southern hairy-nosed wombats in their burrows.

Conservationist Brigitte Stevens says her team say they have pulled out at least 60 dead animals from the water and she thinks hundreds more have been killed.

"For the wild population, it's really a catastrophic event that's happened to them. I haven't seen anything like this before, ever," she said.

Volunteers are doing what they can to dig collapsed dirt from the entrance of burrows and pump water out.

"If we can try and free some of that water out of there, hopefully there'll be some air pockets that the wombats will at least get oxygen and have the potential to get out of the burrows," one of the team said.

In some areas the flooding is yet to recede after storms last week.

Rangers from the Department of Environment and Natural Resources have checked burrows near Blanchetown, but think wombats there have not been affected because they are on higher ground.